Shrinkage Kinetics during Sintering W-Ni-Fe Heavy Alloy with Ultrafine Grain
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摘要: 利用高溫膨脹儀在氫氣氣氛下測定和研究了粉末平均晶粒 ≤ 150nm的W-(Ni-Fe) 10%合金在燒結過程中的膨脹-收縮動力學曲線特征、起始收縮溫度、劇烈收縮溫度、收縮速率與W粉的平均粒徑、燒結溫度、升溫速度以及壓坯密度的關系.結果發現超細粉末壓坯開始及劇烈收縮溫度分別為970℃和1240℃,最大收縮速率為gμm/℃.壓坯密度愈高,合金收縮率愈低;壓坯密度一定時,燒結溫度愈高,合金收縮率愈大.Abstract: The characteristics of swell-shrinkage kinetic curve during sintering the compact of W-Ni-Fe 10% with primary mean grain size less than 200 nm in hydrogen atmosphere was researched by high temperature dilatometer. And the effects of the average size of tungsten particle and green density on shrinkage commence temperature, sharp shrinkage temperature and shrinkage rate were also studied. It shows that shrink age commence temperature and sharp shrinkage temperature of the compact with ultrafine grain are 970℃ and 1240 ℃ respectively. The maximum shrinkage rate is 9 μm/℃. The shrinkage ratio decreases with the increase of green density and increases with the increase of sintering temperature.
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